Signal relay device



FIG. 1. is a front perspective view of the front, right, and top sides of a signal relay device showing our new design;

FIG. 2. is a rear perspective view of the rear, left, and bottom sides thereof;

FIG. 3. is a front view thereof;

FIG. 4. is a rear view thereof;

FIG. 5. is a top plan view thereof;

FIG. 6. is a bottom plan view thereof;

FIG. 7. is a right side view thereof;

FIG. 8. is a left side view thereof; and,

FIG. 9. is a front view in a state where a cover is opened.

The equal length broken lines in the drawings depict portions of the signal relay device that form no part of the claimed design. 

CLAIM The ornamental design for a signal relay device, as shown and described. 